[WICG/webcomponents] [scoped-registries] CustomElementRegistry to support SDLC of generic browser entities (Issue #976)

The most of APIs for objects in browser do support CRUD operations. But for custom element registries it has been implemented only partially. 
* Create - i.e. registration covered by [Scoped Custom Element Registries](https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Scoped-Custom-Element-Registries.md) and partially in [original API](https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry)
* Read - [CustomElementRegistry.get()](https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry/get) is partial implementation. Does not allow to 
    * list the registered tags
    * watch for list changes
* Update - replace the implementation. Facade pattern to
    * semver support in init time,
    * live app upgrade
    * translation
    * analytics
    * ...
* Delete - unregister. The proposals been closed on several occasions. A base for Upgrade ^^

The exact API is a subject for individual discussions.

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